Question

Figure shows four blocks that are being pulled along a smooth horizontal surface. The masses of the blocks and tension in one cord are given. The pulling force $F$ is:

• A. $50N$
• B. $100N$
• C. $125N$
• D. $200N$

Answer 1

The correct option is D $200N$

$40N+30N+20N+10N=100N$

the system is in equilibrium

So, $T_1$(tension) $=F\cos {60}^o$

$100N=\frac{F}{2}$

$F=200N$